Dealing with the d-d-l spam problem

I don’t know if it’s just the pessimist in me, but considering the
efforts before that have failed at controlling the d-d-l spam, I
started wondering whether the recent one will work over the long-term
either (I don’t see the difference between this attempt and previous
ones). So, I spent a little time trying to
think up a solution. This may not be feasible (why worry about
petty technical details when trying to think of a good solution?), and
may be a really stupid idea anyway (it’s just my brain dump from an
hour or two), but I’m posting it here so the world can have a laugh at
my expense. After all, I always appreciate it when others make me
laugh, so I thought I’d try to return the favor–although in a perhaps
slightly different way.